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Particulate macronutrient exports from tropical African montane catchments point to the impoverishment of agricultural soils

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Title Particulate macronutrient exports from tropical African montane catchments point to the impoverishment of agricultural soils
 
Creator Stenfert Kroese, J.
Quinton, J.N.
Jacobs, S.R.
Breuer, Lutz
Rufino, Mariana C.
 
Subject catchment hydrology
agricultural land
soil properties
macronutrients
 
Description Agricultural catchments in the tropics often generate high concentrations of suspended sediments following the conversion of natural ecosystems. The eroded fine particles are generally enriched with carbon (TC) and nutrients (TN and TP) originating from the topsoil of agricultural land. Sediment-associated TC, TN and TP are an important loss to the terrestrial ecosystem and tightly connected to an increase in riverine particulate TC and nutrient export. Soil nutrient depletion can limit crop growth and yields, whereas an excess of nutrients in streams can cause eutrophication in freshwater systems. Streams in East Africa, with widespread land conversion from forests to agriculture, are expected to receive high loads of sediment-associated TC, TN and TP. In this study, we assess the effect of land use on particulate TC, TN and TP concentrations. Suspended sediments (time-integrated, manual-event-based and automatic-event-based sediment samples) were analysed for TC, TN and TP concentrations collected at the outlet of a natural montane forest (35.9), a tea-tree plantation (33.3) and a smallholder agriculture (27.2 km2) catchment in western Kenya during a wet sampling period in 2018 and a drier sampling period in 2019. Particulate TC, TN and TP concentrations were up to 3-fold higher (p
 
Date 2021-03-15
2021-05-07T02:50:22Z
2021-05-07T02:50:22Z
 
Type Journal Article
 
Identifier Stenfert Kroese, J., Quinton, J.N., Jacobs, S.R., Breuer, L. and Rufino, M.C., 2021. Particulate macronutrient exports from tropical African montane catchments point to the impoverishment of agricultural soils. Soil, 7(1): 53-70. https://doi.org/10.5194/soil-7-53-2021
2199-3971
https://hdl.handle.net/10568/113650
https://www.cifor.org/library/8015
https://doi.org/10.5194/soil-7-53-2021
 
Language en
 
Rights CC-BY-4.0
Open Access
 
Format 53-70
 
Publisher Copernicus GmbH
 
Source Soil